Let's see,
John has the current "official" list delivered with the game - so this is from memory. . .
All paints are Testers
Japan is "Afrika mustard"
Britain is "SAC Bomber Tan"
US is "Olive Drab"
Germany is "Panzer Gray"
Italy is "Camouflage Gray"
French is of course "French Blue"
Russia i think was "Boyd Red"
China was a dark brown.
and if you really want to get into it, paint your German minors a light blue-gray and your neutrals a light green.